We just finished Rox's instance, we got a Karma Gift Box and 2 bags of coins, we also got a 12-slot bag and another Karma Gift Box in the mail after finishing.
The patch notes say that it is a daily reward (Except for the rewards you get in the mail), I don't know if Braham has the same rewards.
Video: http://www.youtube.com/watch?v=45oDbfM2l5w (Should work in a few minuts if you see a processing message)